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aio_error(3p) [centos man page]

AIO_ERROR(3P)						     POSIX Programmer's Manual						     AIO_ERROR(3P)

PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond- ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux. NAME
aio_error - retrieve errors status for an asynchronous I/O operation (REALTIME) SYNOPSIS
#include <aio.h> int aio_error(const struct aiocb *aiocbp); DESCRIPTION
The aio_error() function shall return the error status associated with the aiocb structure referenced by the aiocbp argument. The error status for an asynchronous I/O operation is the errno value that would be set by the corresponding read(), write(), fdatasync(), or fsync() operation. If the operation has not yet completed, then the error status shall be equal to [EINPROGRESS]. RETURN VALUE
If the asynchronous I/O operation has completed successfully, then 0 shall be returned. If the asynchronous operation has completed unsuc- cessfully, then the error status, as described for read(), write(), fdatasync(), and fsync(), shall be returned. If the asynchronous I/O operation has not yet completed, then [EINPROGRESS] shall be returned. ERRORS
The aio_error() function may fail if: EINVAL The aiocbp argument does not refer to an asynchronous operation whose return status has not yet been retrieved. The following sections are informative. EXAMPLES
None. APPLICATION USAGE
The aio_error() function is part of the Asynchronous Input and Output option and need not be available on all implementations. RATIONALE
None. FUTURE DIRECTIONS
None. SEE ALSO
aio_cancel(), aio_fsync(), aio_read(), aio_return(), aio_write(), close(), exec(), exit(), fork(), lio_listio(), lseek(), read() , the Base Definitions volume of IEEE Std 1003.1-2001, <aio.h> COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html . IEEE
/The Open Group 2003 AIO_ERROR(3P)

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AIO_FSYNC(3P)						     POSIX Programmer's Manual						     AIO_FSYNC(3P)

PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond- ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux. NAME
aio_fsync - asynchronous file synchronization (REALTIME) SYNOPSIS
#include <aio.h> int aio_fsync(int op, struct aiocb *aiocbp); DESCRIPTION
The aio_fsync() function shall asynchronously force all I/O operations associated with the file indicated by the file descriptor aio_fildes member of the aiocb structure referenced by the aiocbp argument and queued at the time of the call to aio_fsync() to the synchronized I/O completion state. The function call shall return when the synchronization request has been initiated or queued to the file or device (even when the data cannot be synchronized immediately). If op is O_DSYNC, all currently queued I/O operations shall be completed as if by a call to fdatasync(); that is, as defined for synchro- nized I/O data integrity completion. If op is O_SYNC, all currently queued I/O operations shall be completed as if by a call to fsync(); that is, as defined for synchronized I/O file integrity completion. If the aio_fsync() function fails, or if the operation queued by aio_fsync() fails, then, as for fsync() and fdatasync(), outstanding I/O operations are not guaranteed to have been completed. If aio_fsync() succeeds, then it is only the I/O that was queued at the time of the call to aio_fsync() that is guaranteed to be forced to the relevant completion state. The completion of subsequent I/O on the file descriptor is not guaranteed to be completed in a synchronized fashion. The aiocbp argument refers to an asynchronous I/O control block. The aiocbp value may be used as an argument to aio_error() and aio_return() in order to determine the error status and return status, respectively, of the asynchronous operation while it is proceeding. When the request is queued, the error status for the operation is [EINPROGRESS]. When all data has been successfully transferred, the error status shall be reset to reflect the success or failure of the operation. If the operation does not complete successfully, the error status for the operation shall be set to indicate the error. The aio_sigevent member determines the asynchronous notification to occur as specified in Signal Generation and Delivery when all operations have achieved synchronized I/O completion. All other members of the struc- ture referenced by aiocbp are ignored. If the control block referenced by aiocbp becomes an illegal address prior to asynchronous I/O com- pletion, then the behavior is undefined. If the aio_fsync() function fails or aiocbp indicates an error condition, data is not guaranteed to have been successfully transferred. RETURN VALUE
The aio_fsync() function shall return the value 0 to the calling process if the I/O operation is successfully queued; otherwise, the func- tion shall return the value -1 and set errno to indicate the error. ERRORS
The aio_fsync() function shall fail if: EAGAIN The requested asynchronous operation was not queued due to temporary resource limitations. EBADF The aio_fildes member of the aiocb structure referenced by the aiocbp argument is not a valid file descriptor open for writing. EINVAL This implementation does not support synchronized I/O for this file. EINVAL A value of op other than O_DSYNC or O_SYNC was specified. In the event that any of the queued I/O operations fail, aio_fsync() shall return the error condition defined for read() and write(). The error is returned in the error status for the asynchronous fsync() operation, which can be retrieved using aio_error(). The following sections are informative. EXAMPLES
None. APPLICATION USAGE
The aio_fsync() function is part of the Asynchronous Input and Output option and need not be available on all implementations. RATIONALE
None. FUTURE DIRECTIONS
None. SEE ALSO
fcntl(), fdatasync(), fsync(), open(), read(), write(), the Base Definitions volume of IEEE Std 1003.1-2001, <aio.h> COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html . IEEE
/The Open Group 2003 AIO_FSYNC(3P)
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